Studies of the Land- and Sea-Breeze and its Effect on the Pollen

一、陆风和海风结构的基础研究：特别是陆风的三维结构不仅是局地尺度的风，而且是中尺度的风。根据汽球观测和资料分析，中尺度海风是由内陆地区局地低气压引起的，陆风方向是由潮汐改变的。陆海风环流与花粉分布的关系：花粉观测认为，白天由反海风（上层陆风）吹到海洋中部（广岛湾）的杉属（cryptomeria）花粉在夜间被吹回海湾中心的岛屿。花粉被证明是一个很好的示踪剂作为空气污染分析。陆海风对空气污染和城市气候的影响：陆海风与逆温的结合使空气受到污染，陆海风既可以转移热岛核心，也可以转移空气污染区域。

I. Basic studies on the structure of the land- and sea-breeze: Especially the three dimensional structure of the land-breeze was clarified not only as a local-scale breeze but also as a meso-scale one by the pilotballoon methods. According to the piltballoon observations and data analysis, meso-scale sea-breezes were caused by the local depression in the inland area, and the land-breeze direction was modified by the tide.II. Relationship between the land- and sea-breeze circulation and the pollen distribution: The pollen observation made it concluded that the SUGI(cryptomeria) pollen brought about to the central part of the sea (the Hiroshima Bay) by the anti-sea-breeze(upper land-breeze) in daytime was blown back to the island of the Bay center in nighttime. The pollen was proven to be a good tracer as an air pollution analysis.III. The Effect of the land- and sea-breeze on the air pollution and urban climate: It was concluded that the combination of the land-breeze and the temperature inversion made the air polluted and that the land- and sea-breeze can transfers the heat-island core as well as the air polluted area.